The address or destination to which a letter, package, or email is sent.
封筒の左上に自分の住所、中央に宛先を書いた。
I wrote my address in the top left of the envelope and the recipient's address in the center.
メールの宛先を間違えると大変なので、送信前にもう一度確認してください。
It's a big problem to get the recipient wrong in an email, so please check again before sending.
宅配便の宛先にマンション名を省略してしまい、配達が遅れた。
Delivery was delayed because I omitted the apartment name from the shipping address.